TY - GEN A1 - Gnegel, Fabian A1 - Fügenschuh, Armin T1 - An Iterative Graph Expansion Approach for the Scheduling and Routing of Airplanes T2 - Computers & Operations Research Y1 - 2020 SN - 0305-0548 VL - Computers & Operations Research IS - 114 ER - TY - GEN A1 - Fügenschuh, Armin A1 - Homfeld, Henning A1 - Schülldorf, Hanno T1 - Single Car Routing in Rail Freight Transport T2 - Transportation Science Y1 - 2015 U6 - https://doi.org/10.1287/trsc.2013.0486 SN - 1526-5447 SN - 0041-1655 VL - 49 IS - 1 SP - 130 EP - 148 ER - TY - GEN A1 - Fügenschuh, Armin A1 - Junosza-Szaniawski, Konstanty A1 - Lonc, Zbigniew T1 - Exact and Approximation Algorithms for a Soft Rectangle Packing Problem T2 - Optimization Y1 - 2014 U6 - https://doi.org/10.1080/02331934.2012.728217 SN - 1029-4945 SN - 0233-1934 VL - 63 IS - 11 SP - 1637 EP - 1663 ER - TY - GEN A1 - Fügenschuh, Armin A1 - Geißler, Björn A1 - Gollmer, Ralf A1 - Hayn, Christine A1 - Henrion, René A1 - Hiller, Benjamin A1 - Humpola, Jesco A1 - Koch, Thorsten A1 - Lehmann, Thomas A1 - Martin, Alexander A1 - Mirkov, Radoslava A1 - Morsi, Antonio A1 - Rövekamp, Jessica A1 - Schewe, Lars A1 - Schmidt, Martin A1 - Schultz, Rüdiger A1 - Schwarz, Robert A1 - Schweiger, Jonas A1 - Stangl, Claudia A1 - Steinbach, Marc C. A1 - Willert, Bernhard M. T1 - Mathematical Optimization for Challenging Network Planning Problems in Un- bundled Liberalized Gas Markets T2 - Energy Systems Y1 - 2014 U6 - https://doi.org/10.1007/s12667-013-0099-8 SN - 1868-3975 SN - 1868-3967 VL - 5 IS - 3 SP - 449 EP - 473 ER - TY - GEN A1 - Defterli, Özlem A1 - Fügenschuh, Armin A1 - Weber, Gerhard Wilhelm T1 - Modern Tools for the Time-Discrete Dynamics and Optimization of Gene- Environment Networks T2 - Communications in Nonlinear Science and Numerical Simulation Y1 - 2011 U6 - https://doi.org/10.1016/j.cnsns.2011.03.003 SN - 1007-5704 VL - 16 IS - 12 SP - 4768 EP - 4779 ER - TY - GEN A1 - Fügenschuh, Armin T1 - A set partitioning reformulation of a school bus scheduling problem T2 - Journal of Scheduling Y1 - 2011 U6 - https://doi.org/10.1007/s10951-011-0234-0 SN - 1099-1425 SN - 1094-6136 VL - 14 SP - 307 EP - 318 ER - TY - GEN A1 - Frank, Martin A1 - Fügenschuh, Armin A1 - Herty, Michael A1 - Schewe, Lars T1 - The Coolest Path Problem T2 - Networks & Heterogeneous Media Y1 - 2010 U6 - https://doi.org/10.3934/nhm.2010.5.143 SN - 1438-0064 VL - 5 IS - 1 SP - 143 EP - 162 ER - TY - GEN A1 - Fügenschuh, Armin A1 - Göttlich, Simone A1 - Kirchner, Claus A1 - Herty, Michael A1 - Martin, Alexander T1 - Efficient Reformulation and Solution of a Nonlinear PDE-Controlled Flow Network Model T2 - Computing Y1 - 2009 U6 - https://doi.org/10.1007/s00607-009-0038-7 SN - 0010-485X SN - 1436-5057 VL - 85 IS - 3 SP - 245 EP - 265 ER - TY - GEN A1 - Dittel, Agnes A1 - Fügenschuh, Armin A1 - Göttlich, Simone A1 - Herty, Michael T1 - MIP Presolve Techniques for a PDE-based Supply Chain Model T2 - Optimization Methods and Software Y1 - 2009 U6 - https://doi.org/10.1080/10556780902752595 SN - 1029-4937 SN - 1055-6788 VL - 24 IS - 3 SP - 427 EP - 445 ER - TY - GEN A1 - Bambach, Markus A1 - Fügenschuh, Armin A1 - Buhl, Johannes A1 - Jensch, Felix A1 - Schmidt, Johannes ED - Bambach, Markus T1 - Mathematical Modeling and Optimization for Powder-Based Additive Manufacturing T2 - Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming Y1 - 2020 U6 - https://doi.org/10.1016/j.promfg.2020.04.158 SN - 2351-9789 VL - 47 SP - 1159 EP - 1163 ER - TY - GEN A1 - Bähr, Martin A1 - Buhl, Johannes A1 - Radow, Georg A1 - Schmidt, Johannes A1 - Bambach, Markus A1 - Breuß, Michael A1 - Fügenschuh, Armin T1 - Stable honeycomb structures and temperature based trajectory optimization for wire-arc additive manufacturing T2 - Optimization and Engineering N2 - We consider two mathematical problems that are connected and occur in the layer-wise production process of a workpiece using wire-arc additive manufacturing. As the first task, we consider the automatic construction of a honeycomb structure, given the boundary of a shape of interest. In doing this, we employ Lloyd’s algorithm in two different realizations. For computing the incorporated Voronoi tesselation we consider the use of a Delaunay triangulation or alternatively, the eikonal equation. We compare and modify these approaches with the aim of combining their respective advantages. Then in the second task, to find an optimal tool path guaranteeing minimal production time and high quality of the workpiece, a mixed-integer linear programming problem is derived. The model takes thermal conduction and radiation during the process into account and aims to minimize temperature gradients inside the material. Its solvability for standard mixed-integer solvers is demonstrated on several test-instances. The results are compared with manufactured workpieces. KW - Mixed-integer linear programming KW - Geometric optimization KW - Eikonal equation KW - Heat transmission KW - Additive manufacturing KW - Centroidal Voronoi tesselation Y1 - 2021 U6 - https://doi.org/10.1007/s11081-020-09552-5 SN - 1573-2924 VL - 22 IS - 2 SP - 913 EP - 974 ER - TY - GEN A1 - Khan, Mohammad Faisal A1 - Hasan, Md. Gulzarul A1 - Quddoos, Abdul A1 - Fügenschuh, Armin T1 - Goal Programming Models with Linear and Exponential Fuzzy Preference Relations T2 - Symmetry Y1 - 2020 U6 - https://doi.org/10.3390/sym12060934 SN - 2073-8994 VL - 12 IS - 6 ER - TY - GEN A1 - Ali, Irfan A1 - Fügenschuh, Armin A1 - Gupta, Srikant A1 - Modibbo, Umar Muhammad T1 - The LR-Type Fuzzy Multi-Objective Vendor Selection Problem in Supply Chain Management T2 - Mathematics Y1 - 2020 U6 - https://doi.org/10.3390/math8091621 SN - 2227-7390 VL - 8 IS - 9 ER - TY - GEN A1 - Singham, Dashi I. A1 - Cai, Wenbo A1 - Fügenschuh, Armin T1 - Flexible contracting with heterogeneous agents and stochastic demand T2 - International Journal of Production Economics Y1 - 2021 U6 - https://doi.org/10.1016/j.ijpe.2020.107840 SN - 0925-5273 VL - 231 ER -